PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRI - Cosmic Ray Indirect
Features of a single source describing the very end of the energy spectrum of cosmic rays
A. Bakalova*, J. Vicha and P. Travnicek
Full text: pdf
Pre-published on: July 26, 2021
Published on:
Abstract
The energy spectrum of cosmic rays extends over many orders of magnitude with a steep
suppression of the flux at the highest energies. The energy spectrum of ultra-high energy
cosmic rays (UHECR) is measured with great precision by the Pierre Auger Observatory
and Telescope Array. However, the two measured spectra show different slopes
of the suppression of the spectrum at the highest energies. This disagreement can be caused by the ability of
these two experiments to see different parts of the sky and, therefore, in principle,
different sources of UHECR as well. In our study, we investigate the possibility that the
energy spectrum measured by the Pierre Auger Observatory at energies above $\log_{10}(E/\rm{eV})\geq19.5$ could be
explained by a dominant single strong source. We explore the space of possible features
of such a source including its distance, spectral index and mass composition, and compare
the resulting flux after propagation using simulations in CRPropa~3 with the measured data. We show the possible parameters of such a source and explore possible mass composition mixes that could explain the data well.
DOI: https://doi.org/10.22323/1.395.0363
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